/* ===================================================================
   Memosa Landing Page
   Brand: Outfit (display) + Plus Jakarta Sans (body)
   Palette: Amber primary (#e5a30f), Deep Space neutrals
   =================================================================== */

/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Typography */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Amber */
  --amber-300: #fbcf6a;
  --amber-400: #f7b731;
  --amber-500: #e5a30f;
  --amber-600: #c48a09;

  /* Deep Space */
  --space-100: #e2e4e9;
  --space-300: #8b91a0;
  --space-500: #2d3348;
  --space-600: #1c2033;
  --space-700: #13161f;
  --space-800: #0c0e14;

  /* Surfaces */
  --surface-400: #9ca3af;

  /* Semantic */
  --color-bg: var(--space-800);
  --color-surface: rgba(255, 255, 255, 0.03);
  --color-border: rgba(228, 231, 235, 0.10);
  --color-border-focus: rgba(247, 183, 49, 0.4);
  --color-text: var(--space-100);
  --color-text-muted: var(--space-300);
  --color-text-subtle: var(--surface-400);
  --color-primary: var(--amber-400);
  --color-primary-bg: var(--amber-500);
  --color-primary-hover: var(--amber-400);
  --color-primary-pressed: var(--amber-600);
  --color-primary-text: var(--space-800);
  --color-primary-glow: rgba(247, 183, 49, 0.28);
  --color-primary-soft: rgba(247, 183, 49, 0.12);
  --color-success: #22c55e;
  --color-error: #ef4444;

  /* Spacing */
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows (dark mode) */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 0 3px rgba(247, 183, 49, 0.2);

  /* Transitions */
  --transition-fast: 0.1s ease;
  --transition-base: 0.15s ease;
  --transition-slow: 0.25s ease;
}

html, body {
  height: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* --- Animated gradient mesh background --- */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(229, 163, 15, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 60%, rgba(247, 183, 49, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 50% 20%, rgba(240, 99, 24, 0.03) 0%, transparent 50%);
  animation: mesh-drift 20s ease-in-out infinite alternate;
}

@keyframes mesh-drift {
  0% { transform: scale(1) translate(0, 0); }
  33% { transform: scale(1.05) translate(-1%, 2%); }
  66% { transform: scale(0.98) translate(2%, -1%); }
  100% { transform: scale(1.02) translate(-1%, -1%); }
}

/* Subtle grain texture */
.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  opacity: 0.03;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 128px 128px;
}

/* --- Layout --- */
.container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 40px 24px;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 560px;
  width: 100%;
  animation: fade-up 0.8s ease-out both;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Wordmark (SVG logo) --- */
.wordmark {
  margin-bottom: 24px;
  user-select: none;
}

.wordmark svg {
  width: 80px;
  height: 80px;
}

/* --- Tagline --- */
.tagline {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 48px;
  font-weight: 400;
}

/* --- Form container (frosted glass with amber accent) --- */
.form-container {
  width: 100%;
  max-width: 480px;
  background: var(--color-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 5px;
  transition: border-color var(--transition-slow), box-shadow var(--transition-slow), transform var(--transition-slow);
}

.form-container:focus-within {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 4px var(--color-primary-soft), 0 0 30px rgba(247, 183, 49, 0.06);
  transform: scale(1.01);
}

.form-inner {
  display: flex;
  align-items: stretch;
  gap: 0;
}

/* --- Email input --- */
.email-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 16px;
  padding: 14px 20px;
  outline: none;
  font-family: var(--font-body);
  min-width: 0;
}

.email-input::placeholder {
  color: rgba(139, 145, 160, 0.6);
}

/* --- Submit button (amber CTA — dark text on amber bg) --- */
.submit-btn {
  position: relative;
  background: var(--color-primary-bg);
  color: var(--color-primary-text);
  border: none;
  border-radius: var(--radius-lg);
  padding: 14px 28px;
  font-weight: 600;
  font-size: 14px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  flex-shrink: 0;
  overflow: hidden;
  margin: 4px;
}

.submit-btn:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

.submit-btn:active:not(:disabled) {
  background: var(--color-primary-pressed);
  transform: scale(0.98);
  box-shadow: none;
}

.submit-btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

/* Button inner elements */
.btn-text, .btn-spinner, .btn-check {
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-spinner, .btn-check {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.5);
}

/* Loading spinner */
.btn-spinner::after {
  content: '';
  width: 18px;
  height: 18px;
  border: 2px solid rgba(12, 14, 20, 0.2);
  border-top-color: var(--color-primary-text);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Button states */
.submit-btn.is-loading .btn-text { opacity: 0; transform: scale(0.8); }
.submit-btn.is-loading .btn-spinner { opacity: 1; transform: scale(1); }

.submit-btn.is-success { background: var(--color-success); color: #ffffff; }
.submit-btn.is-success .btn-text { opacity: 0; transform: scale(0.8); }
.submit-btn.is-success .btn-check { opacity: 1; transform: scale(1); }

/* --- Error message --- */
.form-error {
  font-size: 12px;
  color: var(--color-error);
  margin-top: 0;
  padding: 4px 16px 0;
  min-height: 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.form-error.visible {
  opacity: 1;
  margin-top: 4px;
  min-height: 18px;
}

/* Shake animation for invalid input */
.form-container.shake {
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.form-container.has-error {
  border-color: rgba(239, 68, 68, 0.5);
}

/* --- Sub text --- */
.sub-text {
  font-size: 14px;
  color: rgba(139, 145, 160, 0.5);
  margin-top: 20px;
  transition: opacity var(--transition-slow);
}

/* --- Success state --- */
.success-state[hidden] {
  display: none;
}

.success-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: fade-up 0.5s ease-out both;
}

.success-icon {
  color: var(--color-success);
  margin-bottom: 4px;
}

.success-heading {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text);
}

.success-sub {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 320px;
  line-height: 1.5;
}

/* --- Footer --- */
.footer {
  position: absolute;
  bottom: 20px;
  font-size: 11px;
  color: rgba(139, 145, 160, 0.25);
  letter-spacing: 0.2px;
  font-family: var(--font-body);
}

/* --- Responsive --- */
@media (max-width: 520px) {
  .wordmark svg {
    width: 64px;
    height: 64px;
  }

  .tagline {
    font-size: 16px;
    margin-bottom: 36px;
  }

  .form-inner {
    flex-direction: column;
    gap: 0;
  }

  .email-input {
    width: 100%;
    text-align: center;
    padding: 14px 16px;
    font-size: 16px;  /* Prevents zoom on iOS */
  }

  .submit-btn {
    width: calc(100% - 8px);
    padding: 14px;
    border-radius: 10px;
    margin: 0 4px 4px;
  }

  .form-container {
    border-radius: 14px;
    padding: 4px;
  }

  .footer {
    position: relative;
    bottom: auto;
    margin-top: 48px;
  }
}